Seisuiji is a small local temple near Byakui Kannon Statue, 45 minutes walk from Takasaki Station. The 520 tree-lined steps make for a very calm and refreshing approach. Afterwards, you can enjoy walking around the Kannon-yama area.
In late June, the hydrangeas are beautiful there.
https://www.city.takasaki.gunma.jp/kankou/history/kiyomizu.html